Anti-theft alarm for book bags



FIG. 1 is a perspective view of an anti-theft alarm for book bags showing my new design, with the broken line showing for illustrative purposes only and forming no part of the claimed design;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a bottom plan view thereof, with the top being a mirror image; and,

FIG. 5 is a left side elevational view thereof. 

The ornamental design for an anti-theft alarm for book bags, as shown and described. 